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  • 1985-1989  (2)
  • 1
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    System concept for a moderate cost Large Deployable Reflector (LDR) (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A study was carried out at JPL during the first quarter of 1985 to develop a system concept for NASA's LDR. Major features of the concept are a four-mirror, two-stage optical system; a lightweight structural composite segmented primary reflector; and a deployable truss backup structure with integral thermal shield. The two-stage optics uses active figure control at the quaternary reflector located at the primary reflector exit pupil, allowing the large primary to be passive. The lightweight composite reflector panels limit the short-wavelength operation to approximately 30 microns but reduce the total primary reflector weight by a factor of 3 to 4 over competing technologies. On-orbit thermal analysis indicates a primary reflector equilibrium temperature of less than 200 K with a maximum gradient of about 5 C across the 20-m aperture. Weight and volume estimates are consistent with a single Shuttle launch, and are based on Space Station assembly and checkout.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Optical Engineering (ISSN 0091-3286); 25; 1045-105
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Millimeter radiometer system technology (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: JPL has had a large amount of experience with spaceborne microwave/millimeter wave radiometers for remote sensing. All of the instruments use filled aperture antenna systems from 5 cm diameter for the microwave Sounder Units (MSU), 16 m for the microwave limb sounder (MLS) to 20 m for the large deployable reflector (LDR). The advantages of filled aperture antenna systems are presented. The requirements of the 10 m Geoplat antenna system, 10 m multified antenna, and the MLS are briefly discussed.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: NASA, Langley Research Center, Earth Science Geostationary Platform Technology; p 167-177
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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